Grinding attachment for lathes.



No. 744,340. PATENTED NOV. 17, 1903'. J. N. HEALD.

GRINDING ATTACHMENT FOR LATHES.

. APPLIOATION.IILED MAR. '1, 19oz.

N0 MODEL. 2 SHEBTS-SHEBT 1.

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fitborwe a.

Nb. 744,340. PATENTBD Nov. 17,1903. J. N. HEALD.

GRINDING ATTACHMENT FOR LATHES,

APPLICATION TILED MAR. 7. 1902. I;

No MODEL.

2 $HEETS-SHEBT 2.

UNITED STATES iatented er 17,1905.-

PATENT OFFICE.

GRINDING ATTACHMENT F OR LATHES.

SPECIFICATION forming part of Letters Patent No. 744,340, dated November17, 1903.

Application filed March 7, 1902. Serial No. 97.044. (110 model.)

To all whom it may concern:

Be it known that I, JAMES N. HEALD, a citizen of the United States,residing at Barre, in the county of Worcester and State ofMassachusetts, have invented a new and useful Grinding Attachment forLathes, of which the following is a specification.

The object of this invention is to provide a strong, simple, andefficient grinding apparatus which can be readily applied to or detachedfrom a lathe and which is adapted not only for sharpening or grindingsubstantially all classes of reamers and milling-cut tcrs, but which isalso adapted for nearly all classes of Work which can be finished in alathe.

To these ends this invention consists of the grinding attachment forlathes and of the combination of parts'therein, as hereinafterdescribed, and more particularly pointed out in the claims at the end ofthis specification.

In the accompanying two sheets of drawings, Figure 1 is a plan view ofsufficient parts of a lathe to illustrate the application of myinvention thereto. Fig. 2 is a rear view of that part of theconstruction which is carried by the tool-rest. Fig. 3 is a front viewof the same partially broken away. Fig. 4 is an enlarged fragmentary.perspective view, partially broken away, of the driving mechanism. Fig.5 is a fragmentary view illustrating the position of the parts when theattachment is employed for grinding or sharpening the radial edges of afacing-cutter or similar tool. Fig. 6 is a perspective view illustratingthe position of the parts when the attachment is used for facing theteeth of a special milling-cutter. Fig. 7 is a perspective viewillustrating the position of the parts for grinding or truing up theface of a piece which may be held in a chuck. Fig. 8 is a perspectiveview showing the relation of the parts for internal grinding, and Fig. 9is a fragmentary view illustrating the application of an additional setof bevel-gears for driving the grinding-arbor when the attachment is tobe used for internal grinding.

In Fig. 1, A designates the lathe-bed; B, the live center; 0, thetail-stock center; D, the head-stock gear; E, the driving-cone; F,

the cross-piece of the carriage, and G and II the slides of a compoundtool-rest.

The primary slide G of the compound toolrest is movable in astraightline transversely across the lathe by means of a handle I, and thesecondary slide 11 of the compound toolrest may be set to differentangular positions and moved in by the handle J. These parts may be ofany of the ordinary or approved constructions employed in engine-lathesand need not be herein described at length.

A grinding attachment for an engine-lathe constructed according to myinvention comprises a driving mechanism preferably arranged to be drivenfrom the cone of the lathe, a grinding mechanism adapted to be securedto the tool-rest of the lathe, and a connection between the drivingmechanism and the grinding mechanism. v I

Referring to Fig. 4 of the drawings for a detail description of theconstruction of driving mechanism which I preferably employ, 10designates a bracket or casting which is pro vided with a number ofgripping-faces 11, which faces 11 are designed to engage the shears orV-ways of a lathe. Carried by the bracket 10 is a jaw 12, which may beclamped in its adjusted position by a screw 13. The bracket 10 and jaw12 constitute a clamp which may be secured rigidly to the bed-piece A.Pivoted in the bracket 10 is a standard or upright l4,and adjustablythreadedin the standard 14 is a stud, pivotally'mounted on which is ayoke 15. J ournaled in the yoke 15 is a driving-shaft l7, and splinedonto the driving-shaft 17 and held in place by the yoke or bearing-piece15 is a friction-wheel 18, consisting of a number of layers of rubber,cloth,

leather, or other compressible material held in place by collars 19.Threaded into a tailpiece extending from the standard 14: is a screw 16.In applying this driving mechanism to a lathe the screw-threaded stud ofthe yoke 15 is screwed up until the drivingshaft 17 is brought intoposition to stand horizontal when connected to operate the grindingmechanism, which is mounted on the toolpost of the lathe, as hereinafterdescribed. The screw 16 is then adjusted to press the friction-wheel 18into engagement with the shell 56.

driving-cone E. The pivotal connection between theyoke and the threadedstud,which carries the same, permits the yoke 15 to swivel or turn toallow a transverse motion of thegrindingmechanism,ashereinafterdescribed.

Iivoted in the bracket 10, and preferably forming the stud orbearing-piece for the upright or standard 14, is a locking arm or catch20, which may be set into engagement with the teeth of the head-stockgear D and may be fastened in place by a thumb-screw 21, thelocking-catch serving to hold the live center of the lathes stationarywhile the grinding mechanism is driven from the driving-cone E.

The grinding mechanism, which is adapted to be secured to the tool-rest,is most clearly As shown in illustrated in Figs. 2 and these figures,this grinding mechanism comprises a bracket or bearing-piece 22, whichmay be fastened to the tool-rest by bolts 24. The base of the bracket ispreferably substantially circular and is provided with slots 23 topermit the bearing-piece to be clamped in place in different relativepositions. Pivotcd on the face of the bearing-piece 22 is a shell 56,which is fastened in place by bolts 57, which extend through slots 58inthe bearingpiece 22, so that the shell 56 may be turned to differentrelative positions.

The shell 56, as illustrated most clearly in Fig. 1, is provided withgraduations or an index cooperating with a setting marked 011 thebearing-piece 22.

At its ends the shell 56 is provided with bearings 59, and journaled inthe bearings 59 is a grinding-arbor 28, which is provided at one endwith a collar or face-plate 29 for receiving an emery-wheel, andthreaded onto the other end of the grinding-arbor are looknuts 30 and31. The bearings of the grinding-arbor can be oiled by removing theoilcaps 32.

Secured on the grinding arbor, as illustrated most already in Fig. 2, isa bevel-pinion 33, which meshes with and is driven from the bevel-gear34, secured on a shaft 25, which is journaled in the pivot-piece or studof the The shaft 25 is connected by a universal joint 26 to thedriving-shaft 17. By means of this construction by loosening the bolts57 the shell 56 may be adjusted to support the grinding-arbor indifferent angular positions. The grinding mechanism may be moved eitherby the travel of the carriage, by the transverse motion of the primaryslide G of the compound tool-rest, or by the motion of the secondaryslide II of the compound tool-rest, and a great variety of grinding orfinishing operations may be accomplished. The oscillation of thefriction-wheel 18 and the sliding of the driving-shaft 17 through thesame permit the free travel and movement of the grinding mechanism.

To adapt my grinding attachment to the accurate grinding and sharpeningof reamers, milling-cutters, or similar tools, I preferably provide thesame with a number of interchangeable lip-rests, by means of which thework may be properly positioned to secure any desired clearance for theteeth of the cutters. As shown in Figs. 1 and 2, a support formed by aclamp is secured on the inner bearing 59 of the grinding-arbor and isfastened in place by a screw 36. At its outer side the clamp 35 isadapted to receive interchangeable lip-rests, which may be secured inplace by nuts 38. For example, in Fig. 2 I have shown the form oflip-rest which may be employed when my attachment is used for grindingreamers or similar cutters. To set my grinding attachment to sharpen theteeth of cutters of this class, the shell 56 is first tipped and clampedat the proper inclination to secure the desired clearance of the teeth,the clearance which will be obtained being indicated by the index on theshell 56. The lip-rest 37 is then adjusted by means of its nuts 38 tothe proper height, so that when the grindingattachment is moved intransversely the upper edge of the lip rest will intersect the lineconnecting the centers of the lathe. The successive teeth of a reamer,either tapered or straight, may then be held in 0011- tact with thelip-rest 37 and the teeth ground by moving the grinding mechanism in theproper direction. For this class of work a cup-wheel K is preferablyemployed, as shown in Figs. 1 and 2.

In Fig. 5 I have shown the relation of the parts for grinding radialteeth. As shown in this figure, the clamp 35 is turned to a differentposition and alip-rest 39,013 different shape from the lip-rest S7, isset into position at the side of an edge-cutting wheel L.

To face off the teeth of milling-cutters or other tools, thegrinding-arbor can be tipped up to the necessary angle and a thinfacegrinding wheel M can be employed, as shown in Fig. 6.

My grinding attachment is not only specially adapted for sharpeningcutters, but it may also be employed for many other classes oflathework. For example, as shown in Fig. 7, the edge-grinding wheel Lmaybe used for facing a piece which may be carried or turned by a chuckin the ordinary manner, and when used for this purpose the locking-catch20 will be thrown out of engagement with the headstock gear, so as topermit the use of a chuck for carrying the work.

In some cases also my grinding attachment may be used to advantage forinternal grinding. For example, as shown in Fig. 8, a small edge-cuttingwheel P may be employed for grinding out a hole through a piece carriedby a chuck.

In practice when my grinding attachment is to be used for internalgrinding, as illustrated in Fig. 8, instead of having the driving-shaft17 directly connected to the shaft 25 by a universal joint 26, Ipreferably interpose a set of bevel-gears 40 between the universal joint26 and the driving-shaft 17, as illustrated in Fig. 9. These bevel-gearsmay be mounted in a shell or attachment which can be applied as aseparate fixture to the grinding mechanism, and where my grindingattachment is to be used for internal grinding I consider the use of theadditional set of bevel-gears 40 of advantage, not only for the reasonthat it permits the grinding-arbor to be more readily turned to thedesired position, but also for the reason that by the use of theadditional set of bevel-gears 4:0 I may,

if desired, secure a further speeding up of the grinding-a1 bor, whichis desirable when using a grinding wheel P of comparatively smallcircumference, as illustrated in Fig. 8.

I am aware that numerous changes may be made in practicing my inventionby those who are skilled in the art without departing from the scopethereof as expressed in the claims. I do not wish, therefore, to belimited to the construction I have herein shown and described; but

WVhat I do claim, and desire to secure by Letters Patent of the UnitedStates, is-

1. In an attachmentfor lathes, the combination of adriving mechanismadapted to be secured to a fixed part of the lathe, and to be actuatedby operative parts of the lathe, a grinding mechanism adapted to besecured to the secondary slide of a compound tool-rest, and a connectionbetween the driving mechanism and grinding mechanism arranged to permitthe grinding mechanism to be moved transversely, longitudinally, or atvarious angles independently of the driving mechanism.

2. In an attachment for lathes, the combination of a driving mechanism,a grinding mechanism, a connection between the driving mechanism andgrinding mechanism arranged to permit the grinding mechanism to be movedto different positions, and a locking-catch for the head-stock gear ofthe lathe.

3. In an attachment for lathes, the combination of a bracket adapted tobe secured to the lathe-bed, a locking-catch mounted in the bracket inposition to engage the head-stock gear of the lathe, an upright orstandard pivotally connected with the bracket by means of thelocking-catch, and a friction-wheel carried by the standard in positionto be driven by the driving-cone of the lathe.

4. In'an attachment for lathes, the combination of a grinding mechanismadapted to be secured to the tool-rest, comprising a support, a shellpivoted on the face thereof, a grinding-arbor journaled in the shell, abevel-pin ion secured on the grinding-arbor, a bevelgear meshing withand driving said bevel-pinion, and driving connections for operating thegrinding mechanism.

5. In an attachment for lathes, the combination of a bearing piece orsupport, means for clamping the bearing piece or support to thetool-rest, a shell pivotally mounted on the bearing-piece, saidbearingpiece and shell being provided with 'graduations for regulatingthe angle at which the grinding-wheel will be presented to the work,means for clamping the shell in its adjusted positions, a grindingarborj ournaled in the shell, a bevel-pinion secured on the grindingarbor, abevel-gear meshing with said pinion, and driving connections arranged topermit the grinding mechanism to be moved to different positions. V 6.In an attachment for lathes, the combination of a bearing -piece adaptedto be secured to the tool-rest of a lathe, a shell pivotally mounted onthe face of the bearingpiece, means for clamping the shell in itsadjusted position, a grindingarbor journaled in the shell, drivingconnections for the grinding-arbor, and clamping-plates adjustablymounted on the shell and adapted to adjustably support interchangeablelip-rests for engaging the teeth of various cutters to present the samein proper position to be ground.

7. In a grinding attachment for lathes, the combination of abearing-piece, means for clamping the same in different relativepositions on the tool-rest of the lathe, a shell pivoted on the face ofthe bearing-piece, clamping-bolts extending through slots in thebearing-piece for holding the shell in different positions, agrinding-arbor journaled in the shell, a bevel-pinion fastened on thegrindingarbor, a bevel-gear meshing with said pinion, a driving-shafthaving a universally-jointed connection with the bevel-gear, africtionwheel splined on the driving-shaft, and means for adjustablysupporting the friction-wheel so that its axis may be brought intoproper position to allow for the swinging movement of the driving-shaft,and so that the same may be set into engagement with the driving-cone ofthe lathe.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

JAMES N. HEALD.

WVitnesses:

J OHN O. BARTHOLOMEVV, 'WILLIAM R. SPOONER.

